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     <title>水质分类说明</title>
    
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<body>
    <div class="water">
        <div class="_header">水体水质主要类别</div>
        <div class="_box">
            <div class="_circle" style="background: #18a3fe;"><span class="_span">I类</span></div>
            <div class="_tx">主要使用于源头水、国家自然保护区。</div>
        </div>
        <div class="_box">
            <div class="_circle" style="background: #0081dc;"><span class="_span">II类</span></div>
            <div class="_tx">主要适用于集中式生活饮用水地表水源地一级保护区、珍稀水生生物栖息地鱼虾类产卵场、仔稚幼鱼的索饵场。</div>
        </div>
        <div class="_box">
            <div class="_circle" style="background: #4ed04c;"><span class="_span">III类</span></div>
            <div class="_tx">主要适用于集中式生活饮用水地表水源地二级保护区、鱼虾类越冬场、洄游通道、水产养殖区等渔业水域及游泳区。</div>
        </div>
        <div class="_box">
            <div class="_circle" style="background: #2b9c2a;"><span class="_span">IV类</span></div>
            <div class="_tx">主要适用于一般工业区用水及人体非直接接触的娱乐用水区。</div>
        </div>
        <div class="_box">
            <div class="_circle" style="background: #f5a623;"><span class="_span">V类</span></div>
            <div class="_tx">主要适用于农业用水区及一般景观要求水域。</div>
        </div>
        <div class="_box" style="border: 0;">
            <div class="_circle" style="background: #ff6766;"><span class="_span" style="padding: 2px 0;">劣V类</span></div>
            <div class="_tx">污染程度超过V类的水。</div>
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    <div class="_line"></div>
    <div class="water" style="margin-top: 8px;">
        <div class="_header">地表水环境质量标准基本项目标准限值节选</div>
        <table>
            <thead>
                <tr>
                    <td>标准值(MG/L)</td>
                    <td>I类</td>
                    <td>II类</td>
                    <td>III类</td>
                    <td>IV类</td>
                    <td>V类</td>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>PH值 (无量纲)</td>
                    <td colspan="5">6 ~ 9</td>
                </tr>
                <tr>
                    <td>高锰酸钾指数<span class="_a">≤</span></td>
                    <td>2</td>
                    <td>4</td>
                    <td>6</td>
                    <td>10</td>
                    <td>15</td>
                </tr>
                <tr>
                    <td>化学需氧量 (COD) <span class="_a">≤</span></td>
                    <td>15</td>
                    <td>15</td>
                    <td>20</td>
                    <td>30</td>
                    <td>40</td>
                </tr>
                <tr>
                    <td>氨氮 <span class="_a">≤</span></td>
                    <td>0.15</td>
                    <td>0.5</td>
                    <td>1.0</td>
                    <td>0.5</td>
                    <td>2.0</td>
                </tr>
                <tr>
                    <td>总磷 <span class="_a">≤</span></td>
                    <td>0.02</td>
                    <td>0.1</td>
                    <td>0.2</td>
                    <td>0.3</td>
                    <td>0.4</td>
                </tr>
            </tbody>
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